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What happens to litmus when it is put into an acid?
AIt turns red
BIt turns blue
CIt turns green
DIt turns black
Answer & Solution
Correct answer: A. It turns red
1. An indicator is a substance that changes colour with acids and bases.
2. Litmus is the best known acid and base indicator.
3. Litmus is red in an acid and blue in a base.
4. In a neutral substance litmus does not change colour at all.
_Source: Siyavula Natural Sciences Grade 7 (CC BY 4.0), Acid-base indicators_
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